Image display apparatus

ABSTRACT

The present disclosure relates to an image display apparatus. The image display apparatus includes: a display including an organic light emitting diode panel (OLED panel); and a controller configured to control the display, wherein the controller calculates an Average Picture Level (APL) of an input image, and in response to the calculated APL being greater than or equal to a first reference value in a high-dynamic range (HDR) mode, the controller decreases the APL and perform luminance conversion based on the decreased APL, and in response to the calculated APL being greater than or equal to the first reference value in a normal mode rather than the HDR mode, the controller performs luminance conversion based on the calculated APL. Accordingly, luminance representation may be improved during displaying image.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the National Stage filing under 35 U.S.C. 371 ofInternational Application No. PCT/KR2019/012064, filed on Sep. 18, 2019,which claims the benefit of earlier filing date and right of priority toKorean Application No. 10-2018-0111808, filed on Sep. 18, 2018, thecontents of which are all hereby incorporated by reference herein theirentirety.

BACKGROUND OF THE DISCLOSURE 1. Field of the Disclosure

The present disclosure relates to an image display apparatus, and moreparticularly to an image display apparatus capable of improvingluminance during displaying image.

2. Description of the Related Art

An image display apparatus is an apparatus for providing an image that auser can watch. The user can watch various images through the imagedisplay apparatus.

Recently, research is conducted on various methods to improve luminancerepresentation during display of images captured by a camera or externalinput images.

SUMMARY

It is an object of the present disclosure to provide an image displayapparatus capable of improving luminance during displaying image.

In accordance with an aspect of the present disclosure, the above andother objects can be accomplished by providing an image displayapparatus, including: a display including an organic light emittingdiode panel (OLED panel); and a controller configured to control thedisplay, wherein the controller calculates an Average Picture Level(APL) of an input image, and in response to the calculated APL beinggreater than or equal to a first reference value in a high-dynamic range(HDR) mode, the controller decreases the APL and perform luminanceconversion based on the decreased APL, and in response to the calculatedAPL being greater than or equal to the first reference value in a normalmode rather than the HDR mode, the controller performs luminanceconversion based on the calculated APL.

Meanwhile, in response to the calculated APL being greater than or equalto the first reference value while not being in the HDR mode, thecontroller may control luminance conversion to be performed based on thecalculated APL.

Meanwhile, in the HDR mode, in response to the calculated APL being afirst APL which is greater than or equal to the first reference value,the controller may control the first APL to be changed to a second APL,which is lower than the first reference value, and may control luminanceconversion to be performed based on the second APL.

Meanwhile, during luminance conversion based on the second APL, thecontroller may increase luminance of a first region of the input image,which is higher than a first reference luminance.

Meanwhile, the controller may control luminance of a region of the inputimage, which is lower than or equal to a second reference luminancelower than the first reference luminance, to remain as it is or todecrease.

Meanwhile, as the second APL increases, the controller may decrease aluminance increment during luminance conversion.

Meanwhile, in the HDR mode, in response to the calculated APL being athird APL which is lower than the first reference value, the controllermay control luminance conversion to be performed based on the third APL.

Meanwhile, during the luminance conversion based on the second APLrather than the third APL, the controller may increase luminance by agreater increment.

Meanwhile, in the normal mode rather than the HDR mode, in response tothe calculated APL being the first APL which is greater than or equal tothe first reference value, the controller may control luminanceconversion to be performed based on the first APL.

Meanwhile, during the luminance conversion based on the second APLrather than the first APL, the controller may increase luminance by agreater increment.

Meanwhile, while controlling luminance of the input image based on theAPL, in response to there being a first luminance region and a secondluminance region in the input image, the second luminance region havingluminance lower than that of the first luminance region, the controllermay control luminance of the first luminance region to increase more.

Meanwhile, in response to a setting input, the controller may change alevel of the first reference value.

Meanwhile, as the level of the first reference value decreases, thecontroller may expand an APL-variable region, and may increase luminanceof the expanded APL-variable region.

Meanwhile, in response to an input of an image quality setting, thecontroller may control displaying of an image quality setting menu forsetting an image quality, and in response to a dynamic tone mapping itembeing selected from the image quality setting menu, the controller maycontrol displaying of a dynamic tone mapping screen for changing thefirst reference value.

Meanwhile, the controller may receive a pointing signal from a remotecontroller, and may control displaying of a pointer, corresponding tothe pointing signal, on the dynamic tone mapping screen.

Meanwhile, while receiving an image having a first pattern, and a secondpattern which is gradually reduced in size, in response to a size of thesecond pattern being greater than or equal to a reference size, thecontroller may increase luminance of the pattern, and in response to thesize of the second pattern being smaller than the reference size, thecontroller may control luminance of the pattern to be maintained at apredetermined level or to remain as it is.

In accordance with another aspect of the present disclosure, the aboveand other objects can be accomplished by providing an image displayapparatus, including: a display; and a controller configured to controlthe display, wherein while receiving an image having a first pattern,and a second pattern which is gradually reduced in size, in response toa size of the second pattern being greater than or equal to a referencesize, the controller may increase luminance of the pattern, and inresponse to the size of the second pattern being smaller than thereference size, the controller may control luminance of the pattern tobe maintained at a predetermined level or to remain as it is.

Meanwhile, the controller may control the luminance of the first patternto remain as it is or to decrease.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram showing an image display apparatus according to anembodiment of the present disclosure;

FIG. 2 is an example of an internal block diagram of the image displayapparatus of FIG. 1 ;

FIG. 3 is an example of an internal block diagram of the controller inFIG. 2 ;

FIG. 4A is a diagram illustrating a control method of a remotecontroller of FIG. 2 ;

FIG. 4B is an internal block diagram of the remote controller of FIG. 2;

FIG. 5 is an internal block diagram of a display of FIG. 2 ;

FIG. 6A and FIG. 6B are diagrams referred to in the description of anorganic light emitting diode panel of FIG. 5 ;

FIG. 7 is a flowchart illustrating an example of an operating method ofan image display apparatus according to an embodiment of the presentdisclosure; and

FIGS. 8 to 13C are diagrams referred to in the description of theoperating method of FIG. 7 .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, embodiments of the present disclosure will be described infurther detail with reference to the accompanying drawings.

In the present disclosure, the terms “module” and “unit”, which are usedherein to signify components, are merely intended to facilitateexplanation of the present disclosure, and the terms do not have anydistinguishable difference in meaning or role. Thus, the terms “module”and “unit” may be used interchangeably.

FIG. 1 is a diagram showing an image display apparatus according to anembodiment of the present disclosure.

Referring to the drawing, an image display apparatus 100 according to anembodiment of the present disclosure may include a display 180.

Meanwhile, the display 180 may be implemented with any one of variouspanels. For example, the display 180 may be any one of a liquid crystaldisplay panel (LCD panel), an organic light emitting diode panel (OLEDpanel), and an inorganic light emitting diode panel (LED panel), and thelike.

Meanwhile, the present disclosure will be focused on an example in whichthe display 180 includes an organic light emitting diode panel (OLEDpanel).

The image display apparatus according to an embodiment of the presentdisclosure includes: the display 180 having an OLED panel 210; and acontroller 170 configured to control the display 180, wherein thecontroller 170 calculates an Average Picture Level (APL) of an inputimage, and in response to the calculated APL being greater than or equalto a first reference value in a high-dynamic range (HDR) mode APref, thecontroller decreases the APL and perform luminance conversion based onthe decreased APL, and in response to the calculated APL being greaterthan or equal to the first reference value in a normal mode rather thanthe HDR mode APref, the controller performs luminance conversion basedon the calculated APL, thereby improving luminance during displayingimage.

Particularly, in the HDR mode, luminance representation may be improvedduring displaying image.

Meanwhile, in response to the calculated APL being greater than or equalto the first reference value while not being in the HDR mode APref, thecontroller may control luminance conversion to be performed based on thecalculated APL. Accordingly, in the normal mode, luminancerepresentation during displaying image is reduced compared to the HDRmode.

Meanwhile, the image display apparatus according to another embodimentof the present disclosure includes: the display 180; and the controller170 configured to control the display 180, wherein while receiving animage having a first pattern PTma, and a second pattern which isgradually reduced in size, in response to a size of the second patternbeing greater than or equal to a reference size, the controller mayincrease luminance of the pattern, and in response to the size of thesecond pattern being smaller than the reference size, the controller maycontrol luminance of the pattern to be maintained at a predeterminedlevel or to remain as it is. Accordingly, luminance representation maybe improved during displaying image.

Meanwhile, the controller 170 may control the luminance of the firstpattern PTma to remain as it is or to decrease. Accordingly, luminancerepresentation may be improved during displaying image.

Various operating methods of the aforementioned image display apparatus100 will be described in further detail later with reference to FIG. 7and the following figures.

Meanwhile, the image display apparatus 100 of FIG. 1 may be a TV, amonitor, a tablet PC, a mobile terminal, a vehicle display, and thelike.

FIG. 2 is an example of an internal block diagram of the image displayapparatus of FIG. 1 .

Referring to FIG. 2 , the image display apparatus 100 according to anembodiment of the present disclosure includes a broadcast receiver 105,an external device interface 130, a memory 140, a user input interface150, a sensor device (not shown), a controller 170, a display 180, andan audio output device 185.

The broadcast receiver 105 may include a tuner module 110, a demodulator120, a network interface 135, and an external device interface 130.

Meanwhile, unlike the drawing, the image receiver 105 may include onlythe tuner module 110, the demodulator 120, and the external deviceinterface 130. That is, the network interface 135 may not be included.

The tuner module 110 selects an RF broadcast signal corresponding to achannel selected by a user or all pre-stored channels among radiofrequency (RF) broadcast signals received through an antenna (notshown). In addition, the selected RF broadcast signal is converted intoan intermediate frequency signal, a baseband image, or an audio signal.

For example, if the selected RF broadcast signal is a digital broadcastsignal, it is converted into a digital IF signal (DIF). If the selectedRF broadcast signal is an analog broadcast signal, it is converted intoan analog baseband image or audio signal (CVBS/SIF). That is, the tunermodule 110 may process a digital broadcast signal or an analog broadcastsignal. The analog baseband image or audio signal (CVBS/SIF) output fromthe tuner module 110 may be directly input to the controller 170.

Meanwhile, the tuner module 110 may include a plurality of tuners forreceiving broadcast signals of a plurality of channels. Alternatively, asingle tuner that simultaneously receives broadcast signals of aplurality of channels is also available.

The demodulator 120 receives the converted digital IF signal DIF fromthe tuner module 110 and performs a demodulation operation.

The demodulator 120 may perform demodulation and channel decoding andthen output a stream signal TS. At this time, the stream signal may be amultiplexed signal of an image signal, an audio signal, or a datasignal.

The stream signal output from the demodulator 120 may be input to thecontroller 170. The controller 170 performs demultiplexing, image/audiosignal processing, and the like, and then outputs an image to thedisplay 180 and outputs audio to the audio output device 185.

The external device interface 130 may transmit or receive data with aconnected external apparatus (not shown), e.g., a set-top box 50. Tothis end, the external device interface 130 may include an A/V input andoutput device (not shown).

The external device interface 130 may be connected in wired orwirelessly to an external apparatus such as a digital versatile disk(DVD), a Blu ray, a game equipment, a camera, a camcorder, a computer(note book), and a set-top box, and may perform an input/outputoperation with an external apparatus.

The A/V input and output device may receive image and audio signals froman external apparatus. Meanwhile, a wireless communicator (not shown)may perform short-range wireless communication with other electronicapparatus.

Through the wireless communicator (not shown), the external deviceinterface 130 may exchange data with an adjacent mobile terminal 600. Inparticular, in a mirroring mode, the external device interface 130 mayreceive device information, executed application information,application image, and the like from the mobile terminal 600.

The network interface 135 provides an interface for connecting the imagedisplay apparatus 100 to a wired/wireless network including the Internetnetwork. For example, the network interface 135 may receive, via thenetwork, content or data provided by the Internet, a content provider,or a network operator.

Meanwhile, the network interface 135 may include a wireless communicator(not shown).

The memory 140 may store a program for each signal processing andcontrol in the controller 170, and may store signal-processed image,audio, or data signal.

In addition, the memory 140 may serve to temporarily store image, audio,or data signal input to the external device interface 130. In addition,the memory 140 may store information on a certain broadcast channelthrough a channel memory function such as a channel map.

Although FIG. 2 illustrates that the memory is provided separately fromthe controller 170, the scope of the present disclosure is not limitedthereto. The memory 140 may be included in the controller 170.

The user input interface 150 transmits a signal input by the user to thecontroller 170 or transmits a signal from the controller 170 to theuser.

For example, the user input interface 150 may transmit/receive a userinput signal such as power on/off, channel selection, screen setting,etc., from a remote controller 200, may transfer a user input signalinput from a local key (not shown) such as a power key, a channel key, avolume key, a set value, etc., to the controller 170, may transfer auser input signal input from a sensor device (not shown) that senses auser's gesture to the controller 170, or may transmit a signal from thecontroller 170 to the sensor device (not shown).

The controller 170 may demultiplex the input stream through the tunermodule 110, the demodulator 120, the network interface 135, or theexternal device interface 130, or may process the demultiplexed signalsto generate and output a signal for image or audio output.

The image signal processed by the controller 170 is input to the display180, and may be displayed as an image corresponding to the image signal.In addition, the image signal processed by the controller 170 may beinput to the external output apparatus through the external deviceinterface 130.

The audio signal processed by the controller 170 may be output to theaudio output device 185 as an audio signal. In addition, the audiosignal processed by the controller 170 may be input to the externaloutput apparatus through the external device interface 130.

Although not illustrated in FIG. 2 , the controller 170 may include ademultiplexer, an image processor, and the like, which will be describedlater with reference to FIG. 3 .

In addition, the controller 170 may control the overall operation of theimage display apparatus 100. For example, the controller 170 may controlthe tuner module 110 to control the tuning of the RF broadcastcorresponding to the channel selected by the user or the previouslystored channel.

In addition, the controller 170 may control the image display apparatus100 according to a user command input through the user input interface150 or an internal program.

Meanwhile, the controller 170 may control the display 180 to display animage. In this case, the image displayed on the display 180 may be astill image or a moving image, and may be a 2D image or a 3D image.

Meanwhile, the controller 170 may display a predetermined object in animage displayed on the display 180. For example, the object may be atleast one of a connected web screen (newspaper, magazine, etc.), anelectronic program guide (EPG), various menus, a widget, an icon, astill image, a moving image, and a text.

Meanwhile, the controller 170 may recognize the position of the userbased on the image photographed by a photographing device (not shown).For example, the distance (z-axis coordinate) between a user and theimage display apparatus 100 may be determined. In addition, the x-axiscoordinate and the y-axis coordinate in the display 180 corresponding toa user position may be determined.

The display 180 generates a driving signal by converting an imagesignal, a data signal, an OSD signal, a control signal processed by thecontroller 170, an image signal, a data signal, a control signal, andthe like received from the external device interface 130.

Meanwhile, the display 180 may be configured as a touch screen and usedas an input device in addition to an output device.

The audio output device 185 receives a signal processed by thecontroller 170 and outputs it as an audio.

The photographing device (not shown) photographs a user. Thephotographing device (not shown) may be implemented by a single camera,but the present disclosure is not limited thereto and may be implementedby a plurality of cameras. Image information photographed by thephotographing device (not shown) may be input to the controller 170.

The controller 170 may sense a gesture of the user based on each of theimages photographed by the photographing device (not shown), the signalsdetected from the sensor device (not shown), or a combination thereof.

The power supply 190 supplies corresponding power throughout the imagedisplay apparatus 100. Particularly, the power supply 190 may supplypower to the controller 170 which may be implemented in the form of asystem on chip (SOC), a display 180 for displaying an image, and anaudio output device 185 for audio output.

Specifically, the power supply 190 may include a converter forconverting an AC power into a DC power, and a DC/DC converter forconverting the level of the DC power.

The remote controller 200 transmits the user input to the user inputinterface 150. To this end, the remote controller 200 may use Bluetooth,a radio frequency (RF) communication, an infrared (IR) communication, anUltra Wideband (UWB), ZigBee, or the like. In addition, the remotecontroller 200 may receive the image, audio, or data signal output fromthe user input interface 150, and display it on the remote controller200 or output it as an audio.

Meanwhile, the image display apparatus 100 may be a fixed or mobiledigital broadcasting receiver capable of receiving digital broadcasting.

Meanwhile, a block diagram of the image display apparatus 100 shown inFIG. 2 is a block diagram for an embodiment of the present disclosure.Each component of the block diagram may be integrated, added, or omittedaccording to a specification of the image display apparatus 100 actuallyimplemented. That is, two or more components may be combined into asingle component as needed, or a single component may be divided intotwo or more components. The function performed in each block isdescribed for the purpose of illustrating embodiments of the presentdisclosure, and specific operation and apparatus do not limit the scopeof the present disclosure.

FIG. 3 is an example of an internal block diagram of the signalprocessor in FIG. 2 .

Referring to the drawing, the controller 170 according to an embodimentof the present disclosure may include a demultiplexer 310, a videoprocessor 320, a processor 330, an OSD processor 340, a mixer 345, aframe rate converter 350, and a formatter 360. In addition, theprocessor 170 may further include an audio processor (not shown) and adata processor (not shown).

The demultiplexer 310 demultiplexes the input stream. For example, whenan MPEG-2 TS is input, it may be demultiplexed into image, audio, anddata signal, respectively. Here, the stream signal input to thedemultiplexer 310 may be a stream signal output from the tuner module110, the demodulator 120, or the external device interface 130.

The video processor 320 may perform image processing on a demultiplexedimage signal. To this end, the video processor 320 may include a videodecoder 325 and a scaler 335.

The video decoder 325 decodes a demultiplexed image signal, and thescaler 335 performs scaling so that the resolution of the decoded imagesignal may be output from the display 180.

The video decoder 325 may include a decoder of various standards. Forexample, a 3D video decoder for MPEG-2, H.264 decoder, a color image,and a depth image, and a decoder for a multiple view image may beprovided.

The processor 330 may control the overall operation of the image displayapparatus 100 or the controller 170. For example, the processor 330 maycontrol the tuner 110 to tune in to an RF broadcast corresponding to achannel selected by a user or a prestored channel.

In addition, the processor 330 may control the image display apparatus100 according to a user command input through the user input interface150 or an internal program.

Further, the processor 330 may control data transmission with thenetwork interface 135 or the external device interface 130.

In addition, the processor 330 may control operations of thedemultiplexer 310, the image processor 320, the OSD processor 340, andthe like in the controller 170.

The OSD processor 340 generates an OSD signal according to a user inputor by itself. For example, based on a user input signal, the OSDprocessor 340 may generate a signal for displaying various pieces ofinformation as a graphic or a text on the screen of the display 180. Thegenerated OSD signal may include various data such as a user interfacescreen of the image display apparatus 100, various menu screens, awidget, and an icon. In addition, the generated OSD signal may include a2D object or a 3D object.

In addition, the OSD processor 340 may generate a pointer that may bedisplayed on the display, based on a pointing signal input from theremote controller 200. In particular, such pointer may be generated by apointing signal processor, and the OSD processor 240 may include apointing signal processor (not shown) for processing such pointingsignal. Obviously, the pointing signal processor (not shown) may beprovided separately from the OSD processor 240, without being providedtherein.

The mixer 345 may mix the OSD signal generated by the OSD processor 340with the decoded video signal processed by the video processor 320. Themixed signal is provided to the frame rate converter 350.

The frame rate converter 350 may convert a frame rate of the inputimage. The frame rate converter 350 may output the image withoutseparate frame rate conversion.

Meanwhile, the formatter 360 may change a format of an input imagesignal into a format suitable for displaying the image signal on adisplay and output the image signal in the changed format.

The formatter 360 may change the format of the image signal. Forexample, the formatter 360 may change the format of the 3D image signalinto any one of various 3D formats such as a side by side format, atop/down format, a frame sequential format, an interlaced format, achecker box format, and the like.

Meanwhile, the audio processor (not shown) in the controller 170 mayperform the audio processing of the demultiplexed audio signal. To thisend, the audio processor (not shown) may include various decoders.

In addition, the audio processor (not shown) in the controller 170 mayprocess a base, a treble, a volume control, and the like.

The data processor (not shown) in the controller 170 may perform dataprocessing of the demultiplexed data signal. For example, when thedemultiplexed data signal is a coded data signal, it may be decoded. Theencoded data signal may be electronic program guide informationincluding broadcast information such as a start time and an end time ofa broadcast program broadcasted on each channel.

Meanwhile, a block diagram of the controller 170 shown in FIG. 3 is ablock diagram for an embodiment of the present disclosure. Eachcomponent of the block diagram may be integrated, added, or omittedaccording to a specification of the controller 170 actually implemented.

Particularly, the frame rate converter 350 and the formatter 360 may beprovided separately without being provided in the controller 170, or maybe provided separately as one module.

FIG. 4A is a diagram illustrating a control method of a remotecontroller of FIG. 2 .

As shown in FIG. 4A(a), it is illustrated that a pointer 205corresponding to the remote controller 200 is displayed on the display180.

The user may move or rotate the remote controller 200 up and down, leftand right (FIG. 4A(b)), and back and forth (FIG. 4A(c)). The pointer 205displayed on the display 180 of the image display apparatus correspondsto the motion of the remote controller 200. Such a remote controller 200may be referred to as a space remote controller or a 3D pointingapparatus, because the pointer 205 is moved and displayed according tothe movement in a 3D space, as shown in the drawing.

FIG. 4A(b) illustrates that when the user moves the remote controller200 to the left, the pointer 205 displayed on the display 180 of theimage display apparatus also moves to the left correspondingly.

Information on the motion of the remote controller 200 detected througha sensor of the remote controller 200 is transmitted to the imagedisplay apparatus. The image display apparatus may calculate thecoordinate of the pointer 205 from the information on the motion of theremote controller 200. The image display apparatus may display thepointer 205 to correspond to the calculated coordinate.

FIG. 4A(c) illustrates a case where the user moves the remote controller200 away from the display 180 while pressing a specific button of theremote controller 200. Thus, a selection area within the display 180corresponding to the pointer 205 may be zoomed in so that it may bedisplayed to be enlarged. On the other hand, when the user moves theremote controller 200 close to the display 180, the selection areawithin the display 180 corresponding to the pointer 205 may be zoomedout so that it may be displayed to decrease. Meanwhile, when the remotecontroller 200 moves away from the display 180, the selection area maybe zoomed out, and when the remote controller 200 approaches the display180, the selection area may be zoomed in.

Meanwhile, when the specific button of the remote controller 200 ispressed, it is possible to exclude the recognition of vertical andlateral movement. That is, when the remote controller 200 moves awayfrom or approaches the display 180, the up, down, left, and rightmovements are not recognized, and only the forward and backwardmovements are recognized. Only the pointer 205 is moved according to theup, down, left, and right movements of the remote controller 200 in astate where the specific button of the remote controller 200 is notpressed.

Meanwhile, the moving speed or the moving direction of the pointer 205may correspond to the moving speed or the moving direction of the remotecontroller 200.

FIG. 4B is an internal block diagram of the remote controller of FIG. 2.

Referring to the drawing, the remote controller 200 includes a wirelesscommunicator 425, a user input device 430, a sensor device 440, anoutput device 450, a power supply 460, a memory 470, and a controller480.

The wireless communicator 425 transmits/receives a signal to/from anyone of the image display apparatuses according to the embodiments of thepresent disclosure described above. Among the image display apparatusesaccording to the embodiments of the present disclosure, one imagedisplay apparatus 100 will be described as an example.

In this embodiment, the remote controller 200 may include an RF module421 for transmitting and receiving signals to and from the image displayapparatus 100 according to a RF communication standard. In addition, theremote controller 200 may include an IR module 423 for transmitting andreceiving signals to and from the image display apparatus 100 accordingto an IR communication standard.

In this embodiment, the remote controller 200 transmits a signalcontaining information on the motion of the remote controller 200 to theimage display apparatus 100 through the RF module 421.

In addition, the remote controller 200 may receive the signaltransmitted by the image display apparatus 100 through the RF module421. In addition, if necessary, the remote controller 200 may transmit acommand related to power on/off, channel change, volume change, and thelike to the image display apparatus 100 through the IR module 423.

The user input device 430 may be implemented by a keypad, a button, atouch pad, a touch screen, or the like. The user may operate the userinput device 430 to input a command related to the image displayapparatus 100 to the remote controller 200. When the user input device430 includes a hard key button, the user may input a command related tothe image display apparatus 100 to the remote controller 200 through apush operation of the hard key button. When the user input device 430includes a touch screen, the user may touch a soft key of the touchscreen to input the command related to the image display apparatus 100to the remote controller 200. In addition, the user input device 430 mayinclude various types of input means such as a scroll key, a jog key,etc., which may be operated by the user, and the present disclosure doesnot limit the scope of the present disclosure.

The sensor device 440 may include a gyro sensor 441 or an accelerationsensor 443. The gyro sensor 441 may sense information about the motionof the remote controller 200.

For example, the gyro sensor 441 may sense information on the operationof the remote controller 200 based on the x, y, and z axes. Theacceleration sensor 443 may sense information on the moving speed of theremote controller 200. Meanwhile, a distance measuring sensor may befurther provided, and thus, the distance to the display 180 may besensed.

The output device 450 may output an image or an audio signalcorresponding to the operation of the user input device 430 or a signaltransmitted from the image display apparatus 100. Through the outputdevice 450, the user may recognize whether the user input device 430 isoperated or whether the image display apparatus 100 is controlled.

For example, the output device 450 may include an LED module 451 that isturned on when the user input device 430 is operated or a signal istransmitted/received to/from the image display apparatus 100 through thewireless communicator 425, a vibration module 453 for generating avibration, an audio output module 455 for outputting an audio, or adisplay module 457 for outputting an image.

The power supply 460 supplies power to the remote controller 200. Whenthe remote controller 200 is not moved for a certain time, the powersupply 460 may stop the supply of power to reduce a power waste. Thepower supply 460 may resume power supply when a certain key provided inthe remote controller 200 is operated.

The memory 470 may store various types of programs, application data,and the like necessary for the control or operation of the remotecontroller 200. If the remote controller 200 wirelessly transmits andreceives a signal to/from the image display apparatus 100 through the RFmodule 421, the remote controller 200 and the image display apparatus100 transmit and receive a signal through a certain frequency band. Thecontroller 480 of the remote controller 200 may store information abouta frequency band or the like for wirelessly transmitting and receiving asignal to/from the image display apparatus 100 paired with the remotecontroller 200 in the memory 470 and may refer to the storedinformation.

The controller 480 controls various matters related to the control ofthe remote controller 200. The controller 480 may transmit a signalcorresponding to a certain key operation of the user input device 430 ora signal corresponding to the motion of the remote controller 200 sensedby the sensor device 440 to the image display apparatus 100 through thewireless communicator 425.

The user input interface 150 of the image display apparatus 100 includesa wireless communicator 151 that may wirelessly transmit and receive asignal to and from the remote controller 200 and a coordinate valuecalculator 415 that may calculate the coordinate value of a pointercorresponding to the operation of the remote controller 200.

The user input interface 150 may wirelessly transmit and receive asignal to and from the remote controller 200 through the RF module 412.In addition, the user input interface 150 may receive a signaltransmitted by the remote controller 200 through the IR module 413according to an IR communication standard.

The coordinate value calculator 415 may correct a hand shake or an errorfrom a signal corresponding to the operation of the remote controller200 received through the wireless communicator 151 and may calculate thecoordinate value (x, y) of the pointer 205 to be displayed on thedisplay 180.

The transmission signal of the remote controller 200 inputted to theimage display apparatus 100 through the user input interface 150 istransmitted to the controller 170 of the image display apparatus 100.The controller 170 may determine the information on the operation of theremote controller 200 and the key operation from the signal transmittedfrom the remote controller 200, and, correspondingly, control the imagedisplay apparatus 100.

In another example, the remote controller 200 may calculate the pointercoordinate value corresponding to the operation and output it to theuser input interface 150 of the image display apparatus 100. In thiscase, the user input interface 150 of the image display apparatus 100may transmit information on the received pointer coordinate value to thecontroller 170 without a separate correction process of hand shake orerror.

In yet another example, unlike the drawing, the coordinate valuecalculator 415 may be provided in the controller 170, not in the userinput interface 150.

FIG. 5 is an internal block diagram of a display of FIG. 2 .

Referring to the drawing, the organic light emitting diode panel-baseddisplay 180 may include an organic light emitting diode panel 210, afirst interface 230, a second interface 231, a timing controller 232, agate driver 234, a data driver 236, a memory 240, a processor 270, apower supply 290, a current detector 510, and the like.

The display 180 receives an image signal Vd, a first DC power V1, and asecond DC power V2, and may display a certain image based on the imagesignal Vd.

Meanwhile, the first interface 230 in the display 180 may receive theimage signal Vd and the first DC power V1 from the controller 170.

Here, the first DC power V1 may be used for the operation of the powersupply 290 and the timing controller 232 in the display 180.

Next, the second interface 231 may receive a second DC power V2 from anexternal power supply 190. Meanwhile, the second DC power V2 may beinput to the data driver 236 in the display 180.

The timing controller 232 may output a data driving signal Sda and agate driving signal Sga, based on the image signal Vd.

For example, when the first interface 230 converts the input imagesignal Vd and outputs the converted image signal va1, the timingcontroller 232 may output the data driving signal Sda and the gatedriving signal Sga based on the converted image signal va1.

The timing controller 232 may further receive a control signal, avertical synchronization signal Vsync, and the like, in addition to theimage signal Vd from the controller 170.

In addition to the image signal Vd, based on a control signal, avertical synchronization signal Vsync, and the like, the timingcontroller 232 generates a gate driving signal Sga for the operation ofthe gate driver 234, and a data driving signal Sda for the operation ofthe data driver 236.

Meanwhile, the timing controller 232 may further output a control signalCs to the gate driver 234.

The gate driver 234 and the data driver 236 supply a scan signal and animage signal to the organic light emitting diode panel 210 through agate line GL and a data line DL respectively, according to the gatedriving signal Sga and the data driving signal Sda from the timingcontroller 232. Accordingly, the organic light emitting diode panel 210displays a certain image.

Meanwhile, the organic light emitting diode panel 210 may include anorganic light emitting layer. In order to display an image, a pluralityof gate lines GL and data lines DL may be disposed in a matrix form ineach pixel corresponding to the organic light emitting layer.

Meanwhile, the data driver 236 may output a data signal to the organiclight emitting diode panel 210 based on a second DC power V2 from thesecond interface 231.

The power supply 290 may supply various power supplies to the gatedriver 234, the data driver 236, the timing controller 232, and thelike.

The current detector 510 may detect the current flowing in a sub-pixelof the organic light emitting diode panel 210. The detected current maybe input to the processor 270 or the like, for a cumulative currentcalculation.

The processor 270 may control various operations in the display 180. Forexample, the processor 270 may control the gate driver 234, the datadriver 236, the timing controller 232, and the like.

Meanwhile, the processor 270 may receive current information flowing ina sub-pixel of the organic light emitting diode panel 210 from thecurrent detector 510.

In addition, the processor 270 may calculate the accumulated current ofeach subpixel of the organic light emitting diode panel 210, based oninformation of current flowing through the subpixel of the organic lightemitting diode panel 210. The calculated accumulated current may bestored in the memory 240.

Meanwhile, the processor 270 may determine as burn-in, if theaccumulated current of each sub-pixel of the organic light emittingdiode panel 210 is equal to or greater than an allowable value.

For example, if the accumulated current of each subpixel of the OLEDpanel 210 is equal to or higher than 300000 A, the processor 270 maydetermine that a corresponding subpixel is a burn-in subpixel.

Meanwhile, if the accumulated current of each subpixel of the OLED panel210 is close to an allowable value, the processor 270 may determine thata corresponding subpixel is a subpixel expected to burn in.

Meanwhile, based on a current detected by the current detector 510, theprocessor 270 may determine a subpixel, having the greatest accumulatedcurrent, to be a burn-in expected subpixel.

Meanwhile, based on a current detected by the current detector 1110, theprocessor 270 may calculate a burn-in subpixel or a burn-in expectedsubpixel of the OLED panel 210, and may control a current, lower than anallocated current, to flow through subpixels adjacent to the calculatedburn-in subpixel or burn-in expected subpixel, thereby extending burn-inof sub-pixels adjacent to the burn-in subpixel. As a result, it ispossible to extend the entire service life of the image displayapparatus 100 having the OLED panel 210.

Meanwhile, the processor 270 may control a current, higher than theallocated current, to flow through the calculated burn-in subpixel, suchthat a low current may flow through the subpixels adjacent to thecalculated burn-in subpixel, thereby preventing a phenomenon ofdecreasing luminance.

Meanwhile, if no burn-in occurs in the OLED panel 210, the processor 270may control a current, lower than the allocated current, to flow throughsubpixels adjacent to the burn-in expected subpixel, which is expectedto burn in, thereby extending burn-in of sub-pixels adjacent to theburn-in expected subpixel. As a result, it is possible to extend theentire service life of the image display apparatus 100 having the OLEDpanel 210.

Meanwhile, the processor 270 may control a data voltage, lower than anallocated data voltage, to be applied to subpixels adjacent to thecalculated burn-in subpixel or burn-in expected subpixel.

Meanwhile, if no burn-in occurs in the OLED panel 210, the processor 270may control a current, lower than the allocated current, to also flowthrough the burn-in expected subpixel which is expected to burn in,thereby extending burn-in of the burn-in expected subpixel. As a result,it is possible to extend the entire service life of the image displayapparatus 100 having the OLED panel 210.

Meanwhile, the processor 270 may control a current having a secondlevel, higher than a first level, to flow through a second subpixellocated at a position further than a first subpixel among subpixelsadjacent to the calculated burn-in subpixel or burn-in expectedsubpixel, such that by controlling a higher current to flow through thesecond subpixel which is expected to have a longer service life, it ispossible to prevent a phenomenon of decreasing luminance.

Meanwhile, the processor 270 may calculate a subpixel, having thegreatest accumulated current in the OLED panel, based on a currentdetected by the current detector 1110, and may control a current, lowerthan the allocated current, to flow through subpixels adjacent to thesubpixel having the greatest accumulated current, thereby extending theentire service life of the image display apparatus 100 having the OLEDpanel 210.

Meanwhile, the processor 270 may control a lower current to flow throughsubpixels located closer to the subpixel having the greatest accumulatedcurrent, thereby extending the entire service life of the image displayapparatus 100 having the OLED panel 210.

FIGS. 6A and 6B are diagrams referred to in the description of anorganic light emitting diode panel of FIG. 5 .

Firstly, FIG. 6A is a diagram illustrating a pixel in the organic lightemitting diode panel 210.

Referring to drawing, the organic light emitting diode panel 210 mayinclude a plurality of scan lines Scan1 to Scann and a plurality of datalines R1, G1, B1, W1 to Rm, Gm, Bin, Wm intersecting the scan lines.

Meanwhile, a pixel (subpixel) is defined in an intersecting area of thescan line and the data line in the organic light emitting diode panel210. In the drawing, a pixel including sub-pixels SR1, SG1, SB1 and SW1of RGBW is shown.

FIG. 6B illustrates a circuit of any one sub-pixel in the pixel of theorganic light emitting diode panel of FIG. 6A.

Referring to the drawing, an OLED subpixel circuit CRT, as an activecircuit, may include a switching transistor SW1, a storage capacitorCst, a driving transistor SW2, and an organic light emitting layer OLED.

The switching transistor SW1 is turned on according to the input scansignal Vdscan, as a scan line is connected to a gate terminal. When itis turned on, the input data signal Vdata is transferred to the gateterminal of a drive switching element SW2 or one end of the storagecapacitor Cst.

The storage capacitor Cst is formed between the gate terminal and thesource terminal of the driving transistor SW2, and stores apredetermined difference between a data signal level transmitted to oneend of the storage capacitor Cst and a DC power (VDD) level transmittedto the other terminal of the storage capacitor Cst.

For example, when the data signal has a different level according to aPlume Amplitude Modulation (PAM) method, the power level stored in thestorage capacitor Cst changes according to the level difference of thedata signal Vdata.

In another example, when the data signal has a different pulse widthaccording to a Pulse Width Modulation (PWM) method, the power levelstored in the storage capacitor Cst changes according to the pulse widthdifference of the data signal Vdata.

The driving transistor SW2 is turned on according to the power levelstored in the storage capacitor Cst. When the driving transistor SW2 isturned on, the driving current (IOLED), which is proportional to thestored power level, flows in the organic light emitting layer OLED.Accordingly, the organic light emitting layer OLED performs a lightemitting operation.

The organic light emitting layer OLED may include a light emitting layer(EML) of RGBW corresponding to a subpixel, and may include at least oneof a hole injecting layer (HIL), a hole transporting layer (HTL), anelectron transporting layer (ETL), and an electron injecting layer(EIL). In addition, it may include a hole blocking layer, and the like.

Meanwhile, all the subpixels emit a white light in the organic lightemitting layer OLED. However, in the case of green, red, and bluesubpixels, a subpixel is provided with a separate color filter for colorimplementation. That is, in the case of green, red, and blue subpixels,each of the subpixels further includes green, red, and blue colorfilters. Meanwhile, since a white subpixel outputs a white light, aseparate color filter is not required.

Meanwhile, in the drawing, it is illustrated that a p-type MOSFET isused as the switching transistor SW1 and the driving transistor SW2, butan n-type MOSFET or other switching element such as a JFET, IGBT, SIC,or the like are also available.

Meanwhile, the pixel is a hold-type element that continuously emitslight in the organic light emitting layer (OLED), after a scan signal isapplied, during a unit display period, specifically, during a unitframe.

Meanwhile, subpixels emit light as a current flows to the organic lightemitting layer OLED in the respective subpixels illustrated in FIG. 6B.

FIG. 7 is a flowchart illustrating an example of an operating method ofan image display apparatus according to an embodiment of the presentdisclosure; and FIGS. 8 to 13C are diagrams referred to in thedescription of the operating method of FIG. 7 .

First, referring to FIG. 7 , a controller 170 may receive an input image(S705).

The input image may be an external image received from an externalsource, or may be an image stored in the memory 140.

For example, the input image may be a broadcast image, an image receivedfrom an external device (USB, mobile terminal, etc.), or an image storedin the memory 140.

Then, the controller 170 may analyze the input image.

Particularly, the controller 170 may calculate an Average Picture Level(APL) in units of frames or scenes of the input image (S710).

Meanwhile, the processor 170 may determine whether a display mode is anHDR mode (S715), and upon determining that a display mode is the HDRmode, the controller 170 may determine whether the calculated APL isgreater than or equal to a first reference value APref.

Here, the HDR mode may be performed according to a user setting or maybe performed automatically if the input image is an HDR image.

Meanwhile, once the HDR mode is activated, if the calculated APL isgreater than or equal to the first reference value APref, the controller170 may decrease the APL (S745), and may control luminance conversion tobe performed based on the decreased APL (S750), thereby improvingluminance. Particularly, an improved luminance representation may beprovided for high luminance region, such that luminance representationduring displaying image may be enhanced.

Meanwhile, upon determining in S715 that a display mode is not the HDRmode, i.e., a normal mode, the controller 170 may control luminanceconversion to be performed corresponding to the calculated APL (S730).

Meanwhile, when the display is in the normal mode, rather than the HDRmode, if the calculated APL is greater than the first reference valueAPref, the controller 170 may control luminance conversion to beperformed based on the calculated APL. Accordingly, in the normal mode,the luminance representation during displaying image is reduced comparedto the HDR mode.

FIG. 8 is a diagram illustrating an APL versus luminance curve.

Referring to the drawing, in the case where an image is displayed on theOLED panel 210 included in the image display apparatus 100, which is aself-luminous element, APL driving may be performed to reduce powerconsumption and the like.

Here, the APL driving may indicate that controlling is performed suchthat as the APL increases, luminance decreases, and as the APLdecreases, luminance increases, as illustrated herein.

As illustrated herein, when the calculated APL is a first averagepicture level Apa, which is greater than or equal to the first referencevalue APref, and the display is in the normal mode, the controller 170may control driving at luminance LLa, but when the display is in the HDRmode, the controller 170 may control luminance to be changed to a secondaverage picture level Apc which is lower than the first reference valueAPref, and may control luminance conversion to be performed based on thesecond average picture level Apc, thereby improving luminance duringdisplaying image.

Specifically, when the calculated APL is a first average picture levelApa, which is greater than or equal to the first reference value APref,and the display is in the normal mode, the controller 170 may controldriving at the luminance LLa, but when the display is in the HDR mode,the controller 170 may control luminance conversion to be performed sothat driving may be performed at luminance LLc which is higher than LLa.Accordingly, if the calculated APL is high in the HDR mode, luminancerepresentation may be improved.

Meanwhile, if the luminance conversion is performed based on the secondaverage picture level Apc rather than the first average picture levelApa, the controller 170 may control luminance to increase by a greaterincrement, thereby improving luminance.

Meanwhile, if, in the HDR mode, the calculated APL is a third averagepicture level Apb which is lower than the first reference value APref,the controller 170 may control luminance conversion to be performedbased on the third average picture level Apb.

Specifically, if the calculated APL is the second average picture levelApb which is lower than the first reference value APref, the controller170 may control driving to be performed at the luminance LLb which ishigher than LLa but lower than LLc, thereby improving luminance.

In this case, if luminance conversion is performed based on the secondaverage picture level Apc rather than the third average picture levelApb, the controller 170 may control luminance to increase by a greaterincrement, thereby improving luminance.

Meanwhile, in the normal mode rather than the HDR mode, if thecalculated APL is the first average picture level Apa which is greaterthan the first reference value APref, the controller 170 may controlluminance conversion to be performed based on the first average picturelevel Apa, thereby improving luminance.

Meanwhile, as the second average picture level Apc increases, theluminance variation during luminance conversion decreases, such that thecontroller 170 may improve luminance representation.

Meanwhile, during luminance conversion based on the second averagepicture level Apc, the controller 170 may increase luminance of a firstregion, which is higher than a first reference luminance, in the inputimage, thereby improving luminance.

Meanwhile, the controller 170 may control luminance of a region of theinput image, which is lower than or equal to a second referenceluminance lower than the first reference luminance, to remain as it isor to decrease, thereby improving luminance, which will be describedwith reference to FIG. 9 .

FIG. 9 is a diagram illustrating an example of performing luminanceconversion based on a plurality of curves when luminance conversion ofan input image is performed.

The controller 170 may calculate an average picture level (APL) in unitsof frames or scenes of an input image, and may control a luminanceconversion curve to change based on the APL.

For example, in the case of a highest APL, the controller 170 performsluminance conversion based on a curve CAPa, and in the case of a lowestAPL, the controller 170 may control luminance conversion to be performedbased on a curve CAPm.

Referring to the drawing, as the APL increases, the controller 170 maydecrease a luminance increment of a second peak image. Accordingly,luminance representation may be improved in consideration of powerconsumption.

Meanwhile, during luminance conversion, the controller 170 may dividethe image into a high gradation region Pc having luminance higher thanor equal to a first reference luminance LVc, an intermediate gradationregion Pb having luminance between the first reference luminance LVc anda second reference luminance LVb, and a low gradation region havingluminance lower than or equal to the second reference luminance LVb.

Further, during luminance conversion, the controller 170 may increasethe luminance of the high gradation region Pc, thereby improvingluminance.

Meanwhile, during luminance conversion, the controller 170 may controlthe luminance of the intermediate gradation region Pb or the lowgradation region Pa to remain as it is or to decrease, thereby improvingluminance.

In the drawing, an example is illustrated in which during luminanceconversion of the intermediate gradation region Pb or the low gradationregion Pa, a luminance conversion curve is skewed downwardly to theright, such that during luminance conversion, the luminance of theintermediate gradation region Pb or the low gradation region Pa mayremain as it is or may decrease.

FIG. 10A is a diagram illustrating an example of an image 1110, on whichluminance conversion is performed in the normal mode.

FIG. 10B is a diagram illustrating an example of an image 1120, on whichluminance conversion is performed in the HDR mode if the calculated APLis higher than or equal to the first reference value APref.

It can be seen that luminance representation of the image 1120 of FIG.10B is improved compared to FIG. 10A, thereby enhancing luminance andcontrast.

Particularly, it can be seen that luminance representation of the highgradation region in the image 1120 of FIG. 10B is improved, therebyenhancing luminance and contrast.

Next, FIG. 11A illustrates an input image 1210, and FIG. 11B illustratesan image 1220, on which APL driving and luminance conversion areperformed such that brightness, luminance, and contrast are improved, asdescribed above.

Particularly, brightness, luminance, and contrast of a first region 1222in the image 1220 may be improved, and color and contrast of a secondregion 1224 in the image 1220 may be improved.

FIG. 12A is a diagram illustrating an image quality setting screen.

Referring to the drawing, when selecting a menu item of the remotecontroller 200, the controller 170 may control displaying of a menuscreen, and when selecting an image quality setting item from the menuscreen, the controller 170 may control an image quality setting screen1110 to be displayed as illustrated herein.

The image quality setting screen 1110 may include a dynamic contrastitem for a contrast setting, a dynamic tone mapping item 1115 for aluminance setting, a super resolution item for a resolution setting, acolor gamut item for a color gamut setting, a color filter item for acolor setting, a gamma item for a gamma setting, and the like.

If the dynamic tone mapping item 1115 is selected based on a buttoninput of the remote controller 200 or based on a selection input by apointer 205 displayed corresponding to movement of the remote controlapparatus 200, the controller 170 may control a dynamic tone mappingscreen 1120 for setting luminance to be displayed as illustrated in FIG.12B.

Meanwhile, the dynamic tone mapping screen 1120 may include a firstreference value item 1122 for setting a level of the first referencevalue Apref, and a second reference value item 1124 for setting a levelof the second reference value Refb.

Based on a button input of the remote controller 200 or based on thepointer 205 displayed corresponding to movement of the remote controller200, the controller 170 may select the first reference value item 1122and may change the level of the first reference value. Accordingly,luminance and contrast may be set according to a user's preference.

FIG. 12B is a diagram illustrating an example in which the firstreference value item 1122 is moved leftward according to a leftwardmovement of the pointer 205 displayed corresponding to the movement ofthe remote controller 200. Accordingly, the controller 170 may lower thelevel of the first reference value Apref.

Accordingly, a reference level Aprefa, lower than the level of the firstreference value Apref, may be set as illustrated in FIG. 12C.

Meanwhile, when the lowered first reference value Aprefa is set asillustrated in FIG. 12C, if the lowered first reference value Aprefa islower than the third average picture level Apb, i.e., if the thirdaverage picture level Apb is greater than or equal to the lowered firstreference value Aprefa, the controller 170 may control the third averagepicture level Apb to be changed to a fourth average picture level Apdwhich is lower than the lowered first reference value Aprefa, and maycontrol luminance conversion to be performed based on the second averagepicture level Apd. Particularly, the controller 170 may controlluminance conversion to be performed at luminance LLD. As describedabove, by lowering the first reference value Aprefa, luminancerepresentation during displaying image may be enhanced.

Meanwhile, in response to a setting input, the controller 170 may changethe level of the first reference value APref.

Meanwhile, as the level of the first reference value APref decreases,the controller 170 may expand an APL-variable region, and may increaseluminance of the expanded APL-variable region. Accordingly, luminancerepresentation may be improved during displaying image.

Meanwhile, while receiving an image, having a first pattern PTma and asecond pattern which is gradually reduced in size, if a size of thesecond pattern is greater than or equal to a reference size, thecontroller 170 may increase luminance of the pattern; and if a size ofthe second pattern is smaller than the reference size, the controller170 may control luminance of the pattern to be maintained at apredetermined level, or may control luminance of the pattern to remainas it is. Accordingly, luminance representation may be improved duringdisplaying image, which will be described with reference to FIGS. 13A to13C.

First, FIG. 13A illustrates an example in which a size of the firstpattern PTma is fixed and a size of the second pattern PTa is a firstsize, in an input image 1610. Particularly, the second pattern PTa hashigh gradation, which is higher than that of the first pattern PTma.

In the drawing, it is illustrated that luminance of the first patternPTma is Grma, and luminance of the second pattern Pta is Gra which ishigher than Grma.

Particularly, as described above, the second pattern PTa may correspondto a case where a luminance level is greater than or equal to the firstreference value.

If, in the HDR mode, the size of the second pattern PTa in an inputimage 1610 is a first size greater than or equal to the reference size,the controller 170 may increase luminance of the pattern, so that theluminance GRa may increase to Graa.

In this manner, luminance representation of the second pattern PTa inthe input image 1610 may be improved.

Then, FIG. 13B illustrates an example in which a size of the firstpattern PTma is fixed and a size of the second pattern PTb is a secondsize, in the input image 1610.

If, in the HDR mode, the size of the second pattern PTb in an inputimage 1620 is the second size, which is smaller than the first size ofFIG. 13A but greater than or equal to the reference size, the controller170 may increase luminance of the pattern, so that luminance GRb mayincrease to Grba.

In this manner, luminance representation of the second pattern PTb inthe input image 1620 may be enhanced. Meanwhile, a luminance incrementmay be smaller than that of FIG. 13A.

Next, FIG. 13C illustrates an example in which a size of the firstpattern PTma in the input image is fixed, and a size of the secondpattern PTb is a third size.

If, in the HDR mode, the size of the second pattern PTc in an inputimage 163 is a third size, which is smaller than the second size of FIG.13B and the reference size, the controller 170 may control luminance GRcto remain as Grc without changing luminance of the pattern.

Accordingly, by changing luminance conversion according to a patternsize relative to the entire image, optimal luminance and contrastrepresentation of the input image may be provided.

An image display apparatus according to an embodiment of the presentdisclosure includes: a display including an organic light emitting diodepanel (OLED panel); and a controller configured to control the display,wherein the controller calculates an Average Picture Level (APL) of aninput image, and in response to the calculated APL being greater than orequal to a first reference value in a high-dynamic range (HDR) mode, thecontroller decreases the APL and perform luminance conversion based onthe decreased APL, and in response to the calculated APL being greaterthan or equal to the first reference value in a normal mode rather thanthe HDR mode, the controller performs luminance conversion based on thecalculated APL, thereby luminance representation may be improved duringdisplaying image.

Particularly, in the HDR mode, luminance representation may be improvedduring displaying image.

Meanwhile, in response to the calculated APL being greater than or equalto the first reference value while not being in the HDR mode, thecontroller may control luminance conversion to be performed based on thecalculated APL. Accordingly, in the normal mode, luminancerepresentation during displaying image is reduced compared to the HDRmode.

Meanwhile, in the HDR mode, in response to the calculated APL being afirst APL which is greater than or equal to the first reference value,the controller may control the first APL to be changed to a second APL,which is lower than the first reference value, and may control luminanceconversion to be performed based on the second APL. Accordingly,luminance representation may be improved during displaying image.

Meanwhile, during luminance conversion based on the second APL, thecontroller may increase luminance of a first region of the input image,which is higher than a first reference luminance. Accordingly, luminancerepresentation may be improved during displaying image.

Meanwhile, the controller may control luminance of a region of the inputimage, which is lower than or equal to a second reference luminancelower than the first reference luminance, to remain as it is or todecrease. Accordingly, luminance representation may be improved duringdisplaying image.

Meanwhile, as the second APL increases, the controller may decrease aluminance increment during luminance conversion. Accordingly, luminancerepresentation may be improved during displaying image.

Meanwhile, in the HDR mode, in response to the calculated APL being athird APL which is lower than the first reference value, the controllermay control luminance conversion to be performed based on the third APL.Accordingly, luminance representation may be improved during displayingimage.

Meanwhile, during the luminance conversion based on the second APLrather than the third APL, the controller may increase luminance by agreater increment. Accordingly, luminance representation may be improvedduring displaying image.

Meanwhile, in the normal mode rather than the HDR mode, in response tothe calculated APL being the first APL which is greater than or equal tothe first reference value, the controller may control luminanceconversion to be performed based on the first APL. Accordingly,luminance representation may be improved during displaying image.

Meanwhile, during the luminance conversion based on the second APLrather than the first APL, the controller may increase luminance by agreater increment. Accordingly, luminance representation may be improvedduring displaying image.

Meanwhile, while controlling luminance of the input image based on theAPL, in response to there being a first luminance region and a secondluminance region in the input image, the second luminance region havingluminance lower than that of the first luminance region, the controllermay control luminance of the first luminance region to increase more.Accordingly, luminance representation may be improved during displayingimage.

Meanwhile, in response to a setting input, the controller may change alevel of the first reference value.

Meanwhile, as the level of the first reference value decreases, thecontroller may expand an APL-variable region, and may increase luminanceof the expanded APL-variable region. Accordingly, luminancerepresentation may be improved during displaying image.

Meanwhile, in response to an input of an image quality setting, thecontroller may control displaying of an image quality setting menu forsetting an image quality, and in response to a dynamic tone mapping itembeing selected from the image quality setting menu, the controller maycontrol displaying of a dynamic tone mapping screen for changing thefirst reference value. Accordingly, luminance representation may beimproved during displaying image.

Meanwhile, the controller may receive a pointing signal from a remotecontroller, and may control displaying of a pointer, corresponding tothe pointing signal, on the dynamic tone mapping screen. Accordingly,the controller may perform luminance conversion based on the pointer andthe like.

Meanwhile, while receiving an image having a first pattern, and a secondpattern which is gradually reduced in size, in response to a size of thesecond pattern being greater than or equal to a reference size, thecontroller may increase luminance of the pattern, and in response to thesize of the second pattern being smaller than the reference size, thecontroller may control luminance of the pattern to be maintained at apredetermined level or to remain as it is. Accordingly, luminancerepresentation may be improved during displaying image.

Meanwhile, an image display apparatus according to another embodiment ofthe present disclosure includes: a display; and a controller configuredto control the display, wherein while receiving an image having a firstpattern, and a second pattern which is gradually reduced in size, inresponse to a size of the second pattern being greater than or equal toa reference size, the controller may increase luminance of the pattern,and in response to the size of the second pattern being smaller than thereference size, the controller may control luminance of the pattern tobe maintained at a predetermined level or to remain as it is.Accordingly, luminance representation may be improved during displayingimage.

Meanwhile, the controller may control the luminance of the first patternto remain as it is or to decrease. Accordingly, luminance representationmay be improved during displaying image.

Meanwhile, an operating method of the image display apparatus accordingto the present disclosure can be realized as a processor-readable codewritten on a recording medium readable by a processor included in theimage display apparatus. The processor-readable recording medium may beany type of recording device in which data is stored in aprocessor-readable manner. Examples of the processor-readable recordingmedium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disc,an optical data storage, and a carrier wave, e.g., data transmissionthrough the Internet. The processor-readable recording medium can bedistributed over a plurality of computer systems connected to a networkso that a processor-readable code is written thereto and executedtherefrom in a decentralized manner.

While the present disclosure has been shown and described with referenceto the preferred embodiments thereof, it should be understood that thepresent disclosure is not limited to the aforementioned specificembodiments, and various modifications and variations may be made bythose skilled in the art without departing from the scope and spirit ofthe invention as defined by the appended claims, and the modifiedimplementations should not be construed independently of the technicalidea or prospect of the present disclosure.

What is claimed is:
 1. An image display apparatus, comprising: a displayincluding an organic light emitting diode panel (OLED panel); and acontroller configured to control the display, wherein the controllercalculates an Average Picture Level (APL) of an input image, and inresponse to the calculated APL being greater than or equal to a firstreference value in a high-dynamic range (HDR) mode, the controllerdecreases the APL and perform luminance conversion based on thedecreased APL, and in response to the calculated APL being greater thanor equal to the first reference value in a normal mode rather than theHDR mode, the controller performs luminance conversion based on thecalculated APL, wherein the controller is further configured to: in theHDR mode, in response to the calculated APL being a first APL which isgreater than or equal to the first reference value, control the firstAPL to be a second APL, which is lower than the first reference value,and perform luminance conversion based on the second APL; and in aluminance conversion in which an input luminance is converted to anoutput luminance; perform the luminance conversion based on a firstluminance conversion curve corresponding to a minimum value of a secondaverage luminance level and a second luminance conversion curvecorresponding to a maximum value of the second average luminance level;in response to the input luminance being less than or equal to a firstlevel, enlarge a downward skew section in the second luminanceconversion curve rather than in the first luminance conversion curve,wherein the output luminance becomes smaller in the downward skewsection; and in response to the input luminance being greater than thefirst level, enlarge a saturation start level of the input luminance inthe second luminance conversion curve rather than in the first luminanceconversion curve, wherein the output luminance starts to be converted toa constant level at the saturation start level of the input luminance.2. The image display apparatus of claim 1, wherein in response to thecalculated APL being greater than or equal to the first reference valuewhile not being in the HDR mode, the controller performs luminanceconversion based on the calculated APL.
 3. The image display apparatusof claim 1, wherein during luminance conversion based on the second APL,the controller increases luminance of a first region of the input image,which is higher than a first reference luminance.
 4. The image displayapparatus of claim 3, wherein the controller controls luminance of aregion of the input image, which is lower than or equal to a secondreference luminance lower than the first reference luminance, to remainas it is or to decrease.
 5. The image display apparatus of claim 1,wherein as the second APL increases, the controller decreases aluminance increment during luminance conversion.
 6. The image displayapparatus of claim 1, wherein in the HDR mode, in response to thecalculated APL being a third APL which is lower than the first referencevalue, the controller performs luminance conversion based on the thirdAPL.
 7. The image display apparatus of claim 6, wherein during theluminance conversion based on the second APL rather than the third APL,the controller increases luminance by a greater increment.
 8. The imagedisplay apparatus of claim 1, wherein in the normal mode rather than theHDR mode, in response to the calculated APL being the first APL which isgreater than or equal to the first reference value, the controllerperforms luminance conversion based on the first APL.
 9. The imagedisplay apparatus of claim 1, wherein during the luminance conversionbased on the second APL rather than the first APL, the controllerincreases luminance by a greater increment.
 10. The image displayapparatus of claim 1, wherein while controlling luminance of the inputimage based on the APL, in response to there being a first luminanceregion and a second luminance region in the input image, the secondluminance region having luminance lower than that of the first luminanceregion, the controller controls luminance of the first luminance regionto increase more.
 11. The image display apparatus of claim 1, wherein asthe level of the first reference value decreases, the controllerincreases an APL-variable region, and increases luminance of theincreased APL-variable region.
 12. The image display apparatus of claim1, further comprising an interface for receiving a pointing signal froma remote controller, wherein the controller is configured to display apointer, corresponding to the pointing signal, on a dynamic tone mappingscreen.
 13. The image display apparatus of claim 1, wherein when a firstimage including a first pattern having a fixed size and a second patternhaving a first size and having a luminance level higher than a luminancelevel of the first pattern is received, and the first size is greaterthan or equal to a reference size, the controller is configured toincrease the luminance level of the second pattern of the first image bya first level in the HDR mode, wherein when a second image including thefirst pattern having the fixed size, and a second pattern having asecond size smaller than the first size and having a luminance levelhigher than the luminance level of the first pattern is received, andthe second size is greater than or equal to the reference size, thecontroller is configured to increase the luminance level of the secondpattern of the second image by a second level smaller than the firstlevel in the HDR mode, and wherein when a third image including thefirst pattern having the fixed size, and a second pattern having a thirdsize smaller than the reference size and having a luminance level higherthan the luminance level of the first pattern is received, thecontroller is configured not to change the luminance level of the secondpattern of the third image in the HDR mode.